Warning lights and coolant

Just arrived back from 2 weeks holiday. Father-in-law drove car to railway station (7 miles, no reported probs). When i drove the car back home the battery warning and engine warning lights illuminated and stayed on. Steering felt sluggish. Nearing home I noticed engine temp off scale. On parking up and switching off car wouldn't restart. Popped bonnet and noticed coolant actually boiling in reservoir! Left car overnight, started first time but both warning lights remain on and steering sluggish. Temp will probably go off scale again.
Back to work on Tuesday so any advice appreciated.
Cheers